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Year 4 outdid themselves! During this unit on light energy, students learned about reflection and refraction as they grasped that light travels in a waveform. Through hands-on activities, they saw how prisms, magnifying glasses and polarised lenses work. They also gained an understanding of the colours of the rainbow as the visible spectrum and what dispersion entails, each colour corresponding to a different wavelength.

反射定律

反射定律表明，无论光线从哪个方向照射到光滑的表面，光线都会以相等的角度反射出去。

The aims covered many requirements for knowledge and understanding, and working scientifically. The children were taught to:

• Recognise that they need light to see things, and that dark is the absence of light

•  Notice that light is reflected from surfaces

• Recognise that light from the sun can be dangerous and that there are ways to protect their eyes

• Recognise that shadows are formed when the light from a light source is blocked by a solid object

•  Find patterns in the way that the size of shadows changes.

这些目标涵盖了对知识、理解和科学工作的许多要求。孩子们学会了：

•认识到他们需要光线才能看到事物，黑暗就是没有光线

•注意光线从表面反射

•认识到来自太阳的光线可能是危险的，并且有保护眼睛的方法

•认识到当光源发出的光被固体物体阻挡时会形成阴影

•以阴影大小变化的方式查找图案。

For this week's science classes, the students had individual light and colour experiments to complete at home. They had to write reports on the investigation to present their findings to their classmates. 

在本周的科学课上，学生们在家完成了单独的光和颜色实验。他们写了调查报告，向同学们介绍他们的发现。

The students used the light refraction and reflection demonstrator to indicate the incidence and reflection of light. The students could successfully demonstrate the difference between reflection and refraction. In reflection, the light ray is reflected back to the same medium, while, in refractions, the light ray passes from one medium to another. While in reflection, the angle of incidence is equal to the angle of reflection, whereas these angles are not equal in refraction. Thus adequately indicating theoretical knowledge in a practical demonstration.

学生们使用光折射和反射演示器来指示光的入射和反射。学生们可以成功地演示反射和折射之间的区别。在反射中，光线被反射回同一介质，而在折射中，光线从一种介质传递到另一种介质。在反射时，入射角等于反射角，而在折射时，这些角度不相等。因此，在实践演示中充分体现了理论知识。

In addition, the students enjoyed working in their groups to label the parts of an eye. Further discussion in this biology class led to learning more about how light enters the eye and changes the light into electrical signals, which travel through the optic nerve to the brain. The brain interprets or reads these signals as an image, or picture, of the object.

此外，学生们喜欢在小组里为眼睛的各个部位贴标签。在这节生物学课上的进一步讨论使我们了解了更多关于光如何进入眼睛并将光转变为电信号，这些电信号通过视神经传递到大脑。大脑将这些信号解释或读取为物体的图像或图片。

Here you will find all of the work Year 4 have done on their unit covering light.  

· Different types of light sources 

· Substances are categorised into transparent, translucent, and opaque, based on the transmission of light through them. 

· Identify and discuss the properties of light and shadows

· Identifying, investigating and experimenting with how light travels in a straight line

· Experiments of reflection – mirrors, eyes, water, moonlight, foil, paper, diamonds, coloured objects

· Experiments of refraction - light as it bends

· Periscopes and kaleidoscopes

在这里，你会发现四年级的所有任务都是在他们的单元覆盖灯上完成的。 

·不同类型的光源

·根据光线透过物质的透射率，物质分为透明、半透明和不透明

·识别并讨论光和阴影的财产

·识别、调查和实验光如何直线传播

·反射实验——镜子、眼睛、水、月光、箔、纸、钻石、有色物体

·折射光弯曲实验

·潜望镜和万花筒